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41d6e33fc9
Improve example files further and add a more generic set of possible helpers for them that can be used. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org>
31 lines
669 B
C
31 lines
669 B
C
#include "../../include/bpf_api.h"
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/* Cyclic dependency example to test the kernel's runtime upper
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* bound on loops. Also demonstrates on how to use direct-actions,
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* loaded as: tc filter add [...] bpf da obj [...]
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*/
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#define JMP_MAP_ID 0xabccba
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BPF_PROG_ARRAY(jmp_tc, JMP_MAP_ID, PIN_OBJECT_NS, 1);
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__section_tail(JMP_MAP_ID, 0)
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int cls_loop(struct __sk_buff *skb)
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{
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char fmt[] = "cb: %u\n";
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trace_printk(fmt, sizeof(fmt), skb->cb[0]++);
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tail_call(skb, &jmp_tc, 0);
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skb->tc_classid = TC_H_MAKE(1, 42);
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return TC_ACT_OK;
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}
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__section_cls_entry
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int cls_entry(struct __sk_buff *skb)
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{
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tail_call(skb, &jmp_tc, 0);
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return TC_ACT_SHOT;
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}
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BPF_LICENSE("GPL");
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